Step 3: Attach the battery and plug in the AC adapter cable. Step 2: Press and hold the power button for 10 seconds. Step 1: Disconnect the battery and unplug the adapter. Step 3: Now plug in the AC adapter and restart your Lenovo laptop. Step 2: Hold down the power button for 15 secs or till your PC turns off. Step 1: Unplug the AC adapter from the Lenovo laptop. Here are the steps to power drain your laptop to fix lenovo backlight not working: There are two types of Lenovo Laptops with detachable batteries and built-in batteries. Power Drain is the process of disconnecting the power to your PC temporarily and allowing the PC to reboot.
Step 4: Now, adjust the backlight from the options provided. Step 3: Launch the app and navigate to Device and then Input & Accessories to find your Keyboard listed there.
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